/* Copyright  (c) 2002 Graz University of Technology. All rights reserved.
 *
 * Redistribution and use in  source and binary forms, with or without 
 * modification, are permitted  provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in  binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment:
 * 
 *    "This product includes software developed by IAIK of Graz University of
 *     Technology."
 * 
 *    Alternately, this acknowledgment may appear in the software itself, if 
 *    and wherever such third-party acknowledgments normally appear.
 *  
 * 4. The names "Graz University of Technology" and "IAIK of Graz University of
 *    Technology" must not be used to endorse or promote products derived from 
 *    this software without prior written permission.
 *  
 * 5. Products derived from this software may not be called 
 *    "IAIK PKCS Wrapper", nor may "IAIK" appear in their name, without prior 
 *    written permission of Graz University of Technology.
 *  
 *  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
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 *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
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 */

package demo.pkcs.pkcs11;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;

import iaik.pkcs.pkcs11.Module;
import iaik.pkcs.pkcs11.Session;
import iaik.pkcs.pkcs11.Token;
import iaik.pkcs.pkcs11.TokenInfo;
import iaik.pkcs.pkcs11.objects.Data;
import iaik.pkcs.pkcs11.objects.Object;



/**
 * This demo program read a data object with a specific label from the token.
 *
 * @author <a href="mailto:Karl.Scheibelhofer@iaik.at"> Karl Scheibelhofer </a>
 * @version 0.1
 * @invariants
 */
public class ReadDataObject {

  static PrintWriter output_;

  static BufferedReader input_;

  static {
    try {
      //output_ = new PrintWriter(new FileWriter("GetInfo_output.txt"), true);
      output_ = new PrintWriter(System.out, true);
      input_ = new BufferedReader(new InputStreamReader(System.in));
    } catch (Throwable thr) {
      thr.printStackTrace();
      output_ = new PrintWriter(System.out, true);
      input_ = new BufferedReader(new InputStreamReader(System.in));
    }
  }

  public static void main(String[] args) {
    if (args.length != 3) {
      printUsage();
      System.exit(1);
    }

    try {
      Module pkcs11Module = Module.getInstance(args[0]);
      pkcs11Module.initialize(null);

      Token token = Util.selectToken(pkcs11Module, output_, input_);
      if (token == null) {
        output_.println("We have no token to proceed. Finished.");
        output_.flush();
        System.exit(0);
      }
      TokenInfo tokenInfo = token.getTokenInfo();

      output_.println("################################################################################");
      output_.println("Information of Token:");
      output_.println(tokenInfo);
      output_.println("################################################################################");

      // open an read-write user session
      Session session = Util.openAuthorizedSession(token, Token.SessionReadWriteBehavior.RW_SESSION, output_, input_);

      output_.println("################################################################################");
      output_.println("searching for data object on the card using this search template... ");
      output_.flush();

      // create certificate object template
      Data dataObjectTemplate = new Data();
      
      // we could also set the name that manages this data object
      //dataObjectTemplate.getApplication().setCharArrayValue("Application Name");
      
      // set the data object's label
      dataObjectTemplate.getLabel().setCharArrayValue(args[1].toCharArray());

      // print template
      output_.println(dataObjectTemplate);
      
      // start find operation
      session.findObjectsInit(dataObjectTemplate);

      Object[] foundDataObjects = session.findObjects(1); // find first

      Data dataObject;
      if (foundDataObjects.length > 0) {
        dataObject = (Data) foundDataObjects[0];
        output_.println("________________________________________________________________________________");
        output_.print("found this data object with handle: ");
        output_.println(dataObject.getObjectHandle());
        output_.println(dataObject);
        output_.println("________________________________________________________________________________");
        // FIXME, there may be more than one that matches the given template, the label is not unique in general
        // foundDataObjects = session.findObjects(1); //find next
      } else {
        dataObject = null;
      }
      
      session.findObjectsFinal();

      output_.println("################################################################################");

      output_.println("################################################################################");
      output_.println("Writing content data (value attribute) to: " + args[2]);
      
      OutputStream dataOutputStream = new FileOutputStream(args[2]);
      
      byte[] data = dataObject.getValue().getByteArrayValue();
      if (data != null) {
        dataOutputStream.write(data);
      } 
      dataOutputStream.flush();
      dataOutputStream.close();       
       
      output_.println("################################################################################");

      session.closeSession();
      pkcs11Module.finalize(null);

    } catch (Throwable ex) {
      ex.printStackTrace();
    }
  }

  protected static void printUsage() {
    output_.println("ReadDataObject <PKCS#11 module name> <data object label> <output file>");
    output_.println("e.g.: ReadDataObject gclib.dll \"Student Data\" data.dat");
  }

}